wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0029 sec (1.344 GiB/sec and 352253.1820 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0028 sec (1.372 GiB/sec and 359550.5618 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0029 sec (1.333 GiB/sec and 349488.0546 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0029 sec (1.332 GiB/sec and 349249.6589 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0029 sec (1.335 GiB/sec and 349846.2590 ops/sec)
umount: /dev/sdb: not mounted.